|Years|Building|City|Height (CTBUH)|Floors|
|---|---|---|---|---|
|1975–present|First Canadian Place|Toronto|298.1 m (978 ft) (355 m (1,165 ft) tip)|72|
|1972-1975|Commerce Court West|Toronto|239.0 m (784 ft) (287.0 m (942 ft) tip)|57|
|1967-1972|Toronto-Dominion Centre|Toronto|222.8 m (731 ft)|56|
|1964-1967|Tour de la Bourse|Montreal|190.0 m (623 ft)|47|
|1962-1964|Place Ville-Marie|Montreal|188.0 m (617 ft)|44|
|1962|Tour CIBC|Montreal|184.0 m (604 ft) (225.6 m (740 ft) tip)|45|
|1931-1962|Commerce Court North|Toronto|145.0 m (476 ft)|34|

Question: how many tallest building in canada have been built in toronto?
Answer: 4